Illuminating appliance.



W. A. DOREY. ILLUMINATING .AYPLIANGH APPLICATION FILED AUG. 12,' 1910.

Patented 001'. 29, 1912.

2 SHEETS-SHEET 1.

A TTOR/V E YS WILLIAM DOREY, OF NEWARK, OHIO,

ASSIGNOR TO HOLOPHANE GLASS COMPANY,

F NEW YORK, N. YA., A CORPORATION OF JERSEY,

ILLUMINATING APPLIANCE.

Specification of Letters Patent.

Appnfftion ined August 1a. 1910. serial No, 576,848.

To all @from 'it may concern Be. it known that I, QN/"ILLIAM A. Donny, a citizen of the United States,'residing at the city of Newark, in the county of Licking, State of Ohio, have invented certain nevv and useful Improvements in Illuminating Appliances, of which the following is a speciiieation, reference being had to the accompanying drawings. The object of my invention is to provide a reflector for artificial ligl1ts,`Which shall combine the'greater efficiency of a reflecting surface of circular cross-section with the practical advantages of a straight-sided month-part. l f

The upper part of my reflector, or part adjacent to the heel, has the figure of a solid ,of revolution of any desired outline. In the lower part, adjacent to the mouth, the Walls of the reflector are carried out in plane surfaces to their intersection With the part of the reflector adjacent to the heel. These plane surfaces may be either parallel to the axis of the upper reflector part, or at other desired angles thereto. The straightsided mouth will ordinarily be at right angles to the axis of the reflector,l but may have any desired inclination.

-li`igure l isan elevation of a reflector embodying my invention. Fig. 2 is a perspecview from lbelovv of another reflector e. lic-dying my'invention. Fig. 3 is an ele'- vaticn of a reflector cut away to show a,

cross section and the course of-typical light rays. Fig. .4 is a' plan'view of a plate sometimes used in connect-ion with my reflectors. Fig'. 5 is a perspective ofa further modification of my invent-ion. Fig. 6 is a perspec` tive of a reflector' embodying my invition used in combination with an inverted pyramidal translucent body placed against its mouth.

Heretofore when prismatic glass reflectors have been used With flat, straightfleetor employed Ehas been rectangular in cross section, and ithas therefore been necessary to adjust the outlines of all of the prisms in order to get the angle of double reflection.

My invention enables me to use in this combination a prismatic reflector in Which this adjustment of the outlines of the reflecting prisms is not required.

sided, generally rectangular plates, the re` My reflector is also much more efeient than one Whose cross-section tlnfoughout. is rectangular or hexagonal or of any similar rectilinear outline.

My reflector generally is of curvilinear cross section to the point Where 'practically all of its relectingvqualities have been secured. By then continuing its Walls in a structure bounded by plane surfaces in the manner shown in vthe-diagram and eX- plained in the detailed 'description of Fig. l, l am enabled to produce a reflector which Will set snugly'in a square. hexagonal or other straight-sided recess and Which will fit perfectly a square, hexagonal or other straight-sided diffusing or directing plate placed over itsI mouth or an inverted pyramidal translucent body or other translucent body with flat faces placed against its mouth.

In Fig. l, t represents the standard heel; is the portion beneath the collar or holder part, and is formed of any desired curvirareareaoer. 29,1912.

linear cross-section. At the points m, however, planes pass at desired inclinations to the base, and the sides of the reflector are then carried out to desired lengths in lines following these planes. ln they figure, the planes are shovvn as perpendicular to the base.

In Fig. 2, a represents the heel; 7) the body portion and c the plane sides. In Fig. 3, the same notation is maintained. al is the source of light. m is the line of intersection of the body port-ion with the plane sides. 0 and 1^ are typical light rays emanating from the source c/. These rays strike the reflecting surface l) at points p and s respectively, and are reected down and out of the open mouth. u is another typical light ray which strikes the plane surface c here shown as a reflecting surface at o and is then reflected in direction fw down and out .of the open mouth of the reflector.

Fig. 4 represents a plate for use with my reflector. The adaptation of the rectilinear plate to the reflector body portion of conventional curvilinear cross-section introduces one of the most advantageous features of this invention. It is Well known that a reflector of curvilinear cross-section, is the most ellieient and adaptable for light purposes. It is also kn Wn that the rectilinear plate is in many cases the more convenient for the purpose of light transmission and direction. The combination, therefore, of a reflector of approximately hemispherical body portion, with a rectangular diffusing or directing plate fitted over its mouth constitutes an illuminating appliance of great efficiency, giving an exceptional degree of light control, and capable of being so modified as to produce many novel and useful illuminating effects. The plate may be designed for diffusion, or direction, or both.

Fig. 5 is a further modification of my invention in which the plane of the mouthopening is inclined at an angle of about 30 to the horizontal. The reflector shown is especially` adapted for use with a light source recessed in a sloping ceiling, vsuch as are found in cars, boats or conveyances.

Fig. 6 is a reflector embodying my invention used in combination with a translucent body fitting over its mouth. The translucent body here shown has the form of an vinverted pyramid and acts todiffuse the reflected light rays. The specific form here shown is but one illustration of the many possibilities in this combination.

I claim broadly the combination of a reflector of theconstruction herein described With any straight sided translucent light diffusing or light directing body fitted over lits mouth.

My reflector is'preferably made of pressed glass, With substantially the Whole of the body portion being provided ivith reflecting prisms which are designed to reflect the light upon a plate for diffusion or direction, or, when no plate is used, directly out of the open mouth. The plane surfaces adjacent to the reflector l mouth may Abe reflective or transmissive of light. In the latter case they may be provided With ribs or prisms to modify or direct, light rays thus constituting a reflector shade. My new construction, however, may be carried out in any suitable materials.

Copies of this patent may he obtained for I claim: l. Refiectors for artificial lights, having the part adjacent to the heel'of curvilinear having a portion of curvilinear cross-section provided with double reflecting prisms, and a plane sided mouth part,the mouth poi'- tion being provided with a cover having diffusing means thereon.

6. A glass reflector for artificial light having the part nearest the collar portion of curvilinear cross-section and provided with double reflecting prisms on its outer surface, and having an open mout-h provided With a cover therefor having light modifying means thereon.

7. A reflector having the portion adjacent to the heel of circular cross section and'a straight sided mouth, With the portion inter-l mediate partially bounded by plane surfaces 'and in combination, a straight sided translucent glass body diffusive of light fitted over the mouth of the reflector.

In testimony whereof I affix my signature in the presence of two Witnesses.

W'ILLIAM A. DOREY.

Witnesses PHILIP HUETWOHL, JOEL B/LIBERMAN.

five cents each, by addressing the Commissioner of Patents Washington, D. C. 

